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Finding the Fourth Proportional to 684.58, 944.72 and 422.75

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Solution

The fourth proportional to 684.58, 944.72 and 422.75 is: 583.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    684.58 : 944.72 = 422.75 : x
  2. Step 2: Convert to fraction form
    684.58/944.72 = 422.75/x
  3. Step 3: Cross multiply
    684.58x = 944.72 × 422.75
  4. Step 4: Simplify right side
    684.58x = 399,380.38
  5. Step 5: Solve for x
    x = 399,380.38/684.58
  6. Step 6: Final answer
    x = 583.39

Related Problems

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Half scale
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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.